Automotive Glossary

Brake Lockup

Brake Lockup

In braking, lockup describes the point at which a tire starts to skid (stops rotating whice the vehicle is in motion) in an emergency stopping situation. A tire's maximum braking force is developed when it is on the verge of lockup, so a car's shortest stopping distances are produced when its front and rear tires are held just short of lockup, giving the advantage of simultaneous steering and braking ability - a locked wheel cannot be steered.

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